Changes in Unemployment and Wage Inequality: An Alternative Theory and Some Evidence
构建了一个企业决定岗位类型并搜寻工人的模型，发现技能工人比例增加或技能偏向型技术进步会改变岗位构成，加剧技能需求、工资不平等和失业，并提供了美国过去二十年的证据。
I present a model where firms decide what types of jobs to create and then search for suitable workers. When there are few skilled workers and the skilled-unskilled productivity gap is small, firms create a single type of job and recruit all workers. An increase in the proportion of skilled workers or skill-biased technical change can create a qualitative change in the composition of jobs, increasing the demand for skills, wage inequality, and unemployment. I provide some evidence that there has been a change in the composition of jobs in the United States during the past two decades.